1 - Nerd Girls



Parameter List

Besides the three possible weights (400, 600, and 800 lbs), we are unsure of numerical values for the rest of the parameters. The most important parameter to determine, based on phone calls with the various companies, is extended and collapsed length.

Suspension Design

Determine the suspension type (coil spring type, double wishbone, multi-link, trailing arm).

Analyze hub and braking systems for dimensions.

Make sure suspension type is compatible and all parts will mate properly.

Make an analysis of the kinematics and determination of suspension geometry.

Make a list of the materials used in the design of the suspension.

Select a coil over shock.

Select a tire size.

Make a 3D model of the suspension and create mechanical drawings of the upper A arm, lower A arm, and coil over shock assemblies.

|Part Number |Manufacturer |Vendor |Description |Cost |Data Sheet |

| | | | | | |

|Parameter |Value |Unit |

|Force on Impact | |Newton |

|Compressive Stress | |KSI |

|Spring Preload | | |

|Compression Damping Rate | | |

|Rebound Damping Rate | | |

|Spring Suspension Travel Distance (SAG) | | |

|Extended Length | | |

|Collapsed Length | | |

|Spring Constant | | |

|Radius of coil (2” vs. 3” usually) | | |

|Remote Reservoir (Y or N) | | |

The parameters of the vehicle that will aid in selection of a coil over shock:

|Parameter |Value |Unit |

|Weight | | |

|Number of Wheels | | |

|Location of center of mass | | |

References















Project Statement

Coil over shocks, made up of a spring, rod, and oil chamber, stabilize the vehicle on rough surfaces. The coil is used to create resistance and the oil chamber is used for damping. The benefits of coil over shocks over pneumatic shocks are superior sensitivity on small bumps, simple, low-maintenance, low cost. A disadvantage of coil over shocks over pneumatic shocks is weight, but this weight difference is not more than a few pounds. The spring in coil over shocks allows the vehicle to handle big bumps.

A main property that differentiates various coil over shocks is its spring. Spring properties that should be tailored to the vehicle are: extended and compressed length, the spring constant, radius of the coil, and the spring sag rate. Also there are general properties of springs that can be used to select the coil over shock. The stiffer the spring the more stabilized the vehicle is. If the spring is too stiff however, the driver will experience a lack of control on rough terrain. If spring extension is not great enough, there is a lack of rebound control and the rider will experience a floating/bouncy ride.

Other factors that should go into selecting a coil over shock are weight, the center of mass, and the number of wheels of the vehicle as well as small vs. large shocks and the possibility of a reservoir.

Coil Over Shock Company List

Arranged from best to worst

Ohlins USA- Jason 828-692-4525 responded promptly and would probably make us something for free in exchange for some publicity on our part. This is most likely our best contact. He would also appreciate a picture of our car. (I guess we'd supply a picture of our design since we have no car yet.) I would like to tell him more of our parameters as soon as we have them available.

Penske- 610-375-6180 has dealt with solar car shocks before. Before progressing further, we would probably need to supply them our parameter information.

Carnera- Ben Abernappy deals with solar cars and he will check his e-mail Monday if we want to contact him with questions etc.

Pro-formance- They wanted the same parameters and are sending me a catalogue that I assume will have the information they request at order.

FOX Racing Shox

Nick Sunsuri, Off-road dept. 619-596-9820 x201

Discount to schools

Recommends 2” coil over, 13”-18” travel

Sending catalog on 11/18/02

Has wide range of products, seems to have worked with solar vehicles before, helpful, and prompt

Bilstein Shocks



 (800) 537-1085 Shane 11/18/02 11:51AM

Have a whole line of shocks for off-road/solar vehicles. Need collapsed/extended lengths to begin process.

Mailing catalog to EECS office

King Shocks

DAVE KingShocks@

714-530-8701

E-mail response: IF THE CAR IS REAL LIGHT WHICH IM SURE IT IS THEN I WOULD RECOMEND OUR 2" COIL OVERS EMULSION STYLE SHOCKS, THEY ARE $435 EACH AND THATS WITH COILS, READY TO BOLT ON YOUR CAR, THEY ARE CUSTOM VALVED FOR YOUR APPLICATION WE CAN MAKE THEM SUPER SOFT WITH LOTS OF REBOUND TO HELP CONTROL SLOW SPEEDS. GIVE US A CALL

Tue, 12 Nov 2002 11:16:55 EST

Olympic Imported Parts Corp

Ralph Bull olympic@

E-mail response: Thanks.  Do you have any physical constraints insofar as extended and compressed length go?  Also, what about strut pressure and mounting capabilities?  All of the units that I could offer are automotive application specific and will need to fall into that type of guideline.

Mon, 11 Nov 2002 17:58:19 –0500

Rancho

1-734-384-7804

Spoke w/John 11/18/02 11:36AM

Faxing spec sheet to EECS office; Recd spec sheet 11/18/02

Sell springs in addition to what exists in a vehcile(i.e. for trucks who need extra bounce protection). Otherwise, they sell shocks without springs and then we have to purchase springs with the right constant, etc. elsewhere

Speedway Motors

Jeff Calkins jscalkins@

Speedway Motors sells shocks for cars weighing 2000-4000lbs.

Recommended Carrera (see above), Pro(see above), QA1

11/18/02 8AM

Tokico Gas Shocks

(800) 548-2549

Fax info to Ray @ 310-898-3084

Left voicemail 11/18/02 11:41AM

Returned call 11/18/02 2PM

Have coil over shocks, only have adjustable ones for Civics and Accords, have to talk to Honda about steering arms, etc to make it work for us

They need spring rate, compressed/extended length, body length, and diagram of shock to help us further

Monroe Shocks and Struts



No main #, just dealer #s

Based on website, only make shocks for cars and trucks.

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